如图所示,理想变压器原线圈接入
交流电.改变开关的断开和闭合状态,观察到电流表
的示数增大了
,电流表
的示数增大了
,电流表均为理想电表,灯泡
、
的阻值不变.则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/2019/4/9/2178627039690752/2179889967915008/STEM/b9d8ee58-d456-4951-ada0-531114dba2e7.png?resizew=266)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f687b3de110fcaf4cfdca6b09d8db1f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/035a5a88e7e2d6ef2b47d992412a1f2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7127210ca4f12500e2913d957291d15f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb960b00b7d4985d659b62eb74f470a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3124958e22835a175deca191a408faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4549e7c048532d3c638f7552473e1a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2aeead5b7404fcc892bc68f83c8fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/2019/4/9/2178627039690752/2179889967915008/STEM/b9d8ee58-d456-4951-ada0-531114dba2e7.png?resizew=266)
A.变压器起升压作用 | B.副线圈中电流频率为50Hz |
C.开关S由闭合变为断开 | D.开关S由断开变为闭合 |
更新时间:2019-04-11 06:20:24
|
【知识点】 变压器两端电路的动态分析
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【推荐1】如图所示,50匝矩形导线框处于磁感应强度为B=
T的水平向右的匀强磁场中,转动时通过滑环、电刷与理想变压器原线圈相连接.已知线框面积S=0.5m2,线框和所有导线的电阻均不计.当线框的角速度ω=200rad/s时,副线圈线接入“220V,60W”灯泡恰好正常发光.则
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/2dff7a05-b6c6-432d-83be-85ff7befe9fd.png?resizew=323)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd92f594c348f7a956607f7b381cc22a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/2dff7a05-b6c6-432d-83be-85ff7befe9fd.png?resizew=323)
A.从图示位置开始计时,原线圈两端的交变电压![]() |
B.理想变压器原、副线圈匝数之比为25:11 |
C.理想变压器原线圈中的电流为![]() |
D.将一电热器与灯泡并联后,灯泡亮度变暗 |
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【推荐2】如图所示,理想变压器的原、副线圈的匝数比为
,现原线圈两端加有交变电压
时,灯泡
、
均正常发光,电压表和电流表可视为理想电表。则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/2b4f97de-57f2-467c-8370-fc205b590a8f.png?resizew=176)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe103f073845122c66f22dcb14b711f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a647b78ca384f3640c1e4ee3ff37dfb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e76322da99c521981992a53339042c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7afbfe404ad5febf1904d763974967b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/2b4f97de-57f2-467c-8370-fc205b590a8f.png?resizew=176)
A.电压表的示数为110V |
B.原、副线圈磁通量的变化率之比为![]() |
C.若将滑动变阻器的滑片P向上滑动,则原线圈输入功率变小 |
D.若将滑动变阻器的滑片P向下滑动,则![]() ![]() |
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